Hi all,
in my board I've to change the recommended coplanar waveguide dimension due to a different Er (dielectric constant) of the material I'm going to use. Trying to re-calculate the dimensions with some tools online I've noticed that the recommended values present in table 9 of layout guidelines lead to a characteristic impedance quite different from the 50 ohm expected.
This is what I can find in Layout Guidelines:
Here I get 54.6of characteristic impedance. While at this site I get 55.
Are that tools adeguate? Are that characteristic impedance the desidered one (because it's still inside a 10% from 50 ohm)?
Thank you
Edit: added pics.